Prince Harry and Meghan did not publicly wish King Charles a happy birthday as he celebrated turning 74 yesterday.
A brand new photo was released of the monarch as he marked his first birthday as King - two months after the death of his mother, the late Queen.
The Prince and Princess of Wales were the only senior royals to mark the occasion publicly, sharing a photo of a beaming King Charles to Twitter.
They wrote: "Wishing a very happy birthday to His Majesty The King!"
And the Royal Collection Trust shared a picture of a young Charles with Princess Anne, saying: "Happy birthday to King Charles III! This photograph from 1951 shows the then Prince Charles kissing the hand of his sister, Princess Anne."
The Royal Family's official Twitter account, which provides updates on the King, Queen Consort and other senior royals, also posted a video of the Band of the Household Cavalry performing Happy Birthday during the Changing of the Guard ceremony.
Meanwhile, the Duke and Duchess of Sussex chose not to share a public message on their Archewell website - which was last updated on Sunday - although it is not known whether they spoke to the monarch in private.
The couple quit Facebook and Twitter in January last year, saying they became alienated by the "hate" they experienced online.
They have not posted to their Sussex Royal Instagram account, which has 9.5million followers, since January 2020.
Princess Anne, Prince Edward and Sophie, Countess of Wessex, similarly do not appear to have any social media pages.
Prince Andrew's Twitter, Instagram and Facebook pages were removed after he was stripped of his military affiliations and royal patronages earlier this year.
Princess Eugenie, Princess Beatrice and Sarah Ferguson, the Duchess of York, did not share any birthday messages to the King on their social media pages.
To mark the occasion, the King officially became Ranger of Windsor Great Park, 70 years after the Duke of Edinburgh was appointed to the post.
The role of Ranger offers oversight and guidance to the deputy ranger and his team in the day-to-day stewardship of one of the country's oldest landed estates.
Paul Sedgwick, The Crown Estate’s managing director, rural and deputy ranger of Windsor Great Park, said: "We are honoured to have His Majesty as Ranger of Windsor Great Park, continuing a long tradition of the Sovereign and members of the Royal Family holding this role.
"Windsor has a wonderful heritage with many precious natural habitats.
"His Majesty’s passion and commitment to the natural world will be invaluable as we seek to become a centre of excellence for environmental best practice, preserving and enhancing the Great Park for generations to come."
A new photograph of the monarch in a tweed blazer, tie and corduroy trousers leaning against an ancient oak tree in the park was also released by Buckingham Palace.
Gun salutes fired across the capital, with the King’s Troop Royal Horse Artillery firing 41 volleys from midday at London’s Green Park, and immediately afterwards the Band of the Scots Guards performed Happy Birthday in the park.
An hour later the Honourable Artillery Company fired a 62-gun salute at the Tower of London.
